find /path/to/base/dir -type d -print0 | xargs -0 chmod 755
find /path/to/base/dir -type f -print0 | xargs -0 chmod 644

find . -maxdepth 2 -name '*.py' -type f | xargs -0 chmod +x

=== REPLACE ALL INSTANCES ON OSX ===
LC_ALL=C find ./ -type f -name "*.py" -exec sed -i '.bak' -e 's/trade_fee_percent/curve_fee_mult/g' {} \;

== MULTIPLE FILETYPES
find ./ -type f ( -iname *.jpg -o -iname *.png )